Parachute Boy Escape

A boy jumped with a parachute from a flying airplane. His target was to
reach a castle which is located in the middle of a forest. While he was
gliding in the parachute wind flew vigorously and pushed him towards a
building somewhere in the forest. His parachute got separated from him
and he fell near that building and his parachute fell on the roof of
that building. Help him get to the top of that building so that he can
get his parachute back and fly to his target